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/*
*
* Copyright 2015, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif /* _GNU_SOURCE */
#include <grpc/support/port_platform.h>
#ifdef GPR_CPU_LINUX
#include <sched.h>
#include <errno.h>
#include <unistd.h>
#include <string.h>
#include <grpc/support/cpu.h>
#include <grpc/support/log.h>
#include <grpc/support/sync.h>
static int ncpus = 0;
static void init_num_cpus() {
/* This must be signed. sysconf returns -1 when the number cannot be
determined */
ncpus = (int)sysconf(_SC_NPROCESSORS_ONLN);
if (ncpus < 1) {
gpr_log(GPR_ERROR, "Cannot determine number of CPUs: assuming 1");
ncpus = 1;
}
}
unsigned gpr_cpu_num_cores(void) {
static gpr_once once = GPR_ONCE_INIT;
gpr_once_init(&once, init_num_cpus);
return (unsigned)ncpus;
}
unsigned gpr_cpu_current_cpu(void) {
int cpu = sched_getcpu();
if (cpu < 0) {
gpr_log(GPR_ERROR, "Error determining current CPU: %s\n", strerror(errno));
return 0;
}
return (unsigned)cpu;
}
#endif /* GPR_CPU_LINUX */
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